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Old 24th July 2002, 11:18 PM   #1
wchick is offline wchick  United States
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Exclamation Where to obtain matched mosfet for SOZ?

Where to get matched mosfet like IRFP240 or IRFP244 for SOZ? I can't afford to buy hundred of them to match myself. Anyone has spare pair that I can have? Thanks.
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Old 26th July 2002, 11:10 PM   #2
PedroPO is offline PedroPO  Portugal
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Buy a dozen like I did and try it out.
At first attempt I got 50mV DC offset at both channels.
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Old 26th July 2002, 11:49 PM   #3
wchick is offline wchick  United States
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It might be the only way to go. For matching IRFP244 for SOZ, what voltage and current should be used to feed the mosfet? I read the A75 article about matching mosfet. Can I just use the same setup for SOZ? And how do you guys setup the matching circuit? I plan to use wall-mount adapter to provide 12V (don't know if it works). Your feedback is appreciated. Thanks.

Wallace
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Old 27th July 2002, 01:02 AM   #4
PassFan is offline PassFan  United States
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The original article suggests building the circuit and swapping them out until you obtain a match. You can also make up any difference using resistance on one side. The A75 article gives the formula for calculating the value of resistance. Good Luck
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Old 28th July 2002, 09:16 AM   #5
PedroPO is offline PedroPO  Portugal
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I first used the A75 article to match Mosfet's. I remember that I used only resistors, aligator clips, heatsink, Mosfet and power source.

After a mail to Nelson Pass (i didn't know this forum) he told me to try it out, so I did and I succeeded.

Leave the Mosfet matching for Pass Labs.

If we start doing all the pro's stuff, they will be out of bussiness, and we don't want that!
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